Lock nut



June 6,1944. I B. SOSNICK 2,350,641 r LOOK NUT I Filed Nov. 17. 1959 fig -2 INVENTOR v BENJAM/N jOJ/V/C K ATTORNEYj Patented June 6, 1944 l scram v LOCK NUT Benjamin souuck. San Francisco, an.

Application November 17, 1939, Serial No. 304,933 3 Claims. X01. 151-31) This invention relates to lock nuts and has for its objects improved means formed on a nut for preventing accidental unscrewing of such but from a bolt when the latter istightened against a fixed surface, and which means is cheaply and economically formed on such nut and does not injure the threads on a bolt. Another object is a nut provided with improved means for locking the same on a bolt against accidental unscrewing therefrom while permitting the sameto be unscrewed without injury to the threads on the bolt upon application of intentional excessive force applied to the nut, and a still further object is improved means of the character described above which functions to secure the nut on a bolt upon normal tightening force being applied to the nut. Other objects and advantages will appear in the specification and drawing. In the drawing, Fig. l is a perspective view of a nut showing the invention.

Fig. 21s a fragmentary sectional view taken In operation (best indicated in Fig. 4 for either form of the invention) the nut is threaded onto bolt I followinganother plane nut l or any other desired object thatclosely fits the bolt. Upon tightening the nut I the burr 1"will engage the element 4 that preceded it onto the bolt, and will tightly jam the burr into the thread of the bolt and toward the body of the bolt by being bent or moved toward the bolt axis generally.

since said burr is relatively easily distorted. The provision of the grooves or cut-out portions of the burr causes each section of the burr to trip circumferentially spaced surfaces in the bolt through one side of the nut ofFig. 1 transversely of the threads and through the locking means on such nut.

Fig. 3 is a plan view of a nut showing a slightly changed form of the invention.

Fig. 4 is a sectional view of the nut of Fig. 3

taken along 4-4 thereof with the nut on a bolt and slightly spaced from a member against which the nut is to be tightened and which bolt also shows a form of the invention adapted to be used with any nut. I Y

In detail, referring to Figs. 1 and 2 my invention comprises providing a burr l on a nut projecting outwardly around the threaded opening through such nut on the side of the nut that is adapted to engage another nut or object on the bolt against which the nut is to be tightened. The radially facing side or end of the nut on which 'the burr I is formed, is provided with radially extending grooves 2 at equally spaced points therearound, which grooves also extend across the burr, removing portions of the burr where the grooves are formed, as best indicated in Fig. 1. This radial grooving of the end of the nut is found to appreciably increase the locking effect of the nut and to facilitate the accomplish ment of the said eiifect with no greater tightenin force than is required in normal tightening of the conventional nut.

InjFig. 3, a nut is shown in which the burr ,I' only, is cut away at spaced points 2', and while the Figs. 1 and 2 show the preferred form of the invention, nevertheless. the burrs in Fig. 3 sirnilarly function to cause the desired result.

threads and thus tend to be pressed into the material of the bolt and to the surface of the object engaged by the nut. The resultis a more secure locking of the nut on the bolt. also by cutting away portions of the burr, the remaining portions are more readily .distorted, or jammed against the bolt threads, and by cutting out sections of the end oi the nut, as indicated on Fig. 1, there is a firmer seating ofthe nut and greater resistance between said end and the adjacent side of the object against which the bolt is tightened.

It will be noted (Figs. 2 and 4) that the radially outer sides of said burr are tapered in direction from their juncture with nut toward the central axis of the nut-opening. and that the outer edges of the burr are relatively sharp and thin, thus the only directionin which the burr can be distorted when the latter engages nut 4 or other object, is toward the central axis of the nut, or toward bolt 3. Hence a wedging or jamming of the burr on the bolt is assured. In

the claims, unless otherwise specifically restricted,

the term burr is intended to cover-a continuous annular burr, or separate sections of an annular burr, whether substantiallyspaced apart or merely transversely split at one or more points. I

. The bolt shown in Fig. 4 also shows the invention in which the inner side of the bolt head is slotted at I to provide grooves like those shown at 2 in Fig. 1. At their radiallyinner ends, the lands 8 (Fig. 4) extend slantingly toward the bolt shank as indicated at I. The slanted ends of said lands tend to press into thesurface of the member 8 to be engaged by the bolt head, thus preventirg turning or the bolt.

In all forms of the invention disclosed, since there is no destruction or impairment of the nuts or bolts, they may be used again.

Having described my invention, I claim:

1. A lock nut having a threaded opening extending through the center thereof: a burr in the tom of a slightly raised edge iormed around said opening and projecting axially and outwardly oi the body of said nut on the advancing side or the nut toward an obiect to be engaged by said burr and nut when the latter is screwed on a bolt toward sufih object; said burr having its radially outwardly facing side, tapered in direction from projecting from one side oi said body provided with a nut thereon: a burr on said nut proiecting axially from the side of the latter adjacent said body, said burr being formed with a relatively sharp axially outwardly facing edge adapted to closely follow the contour of the threads the advancing side of the nut toward the outer edge of said burr. whereby upon tightening said nut against said object, said 'burrswill be impinged. between the thread oi the bolt and said object to provide a tight engagement between said nut, bolt and object.

2. In a construction as defined in claim 1, said advancing side of said nut-being formed with groovesextending transversely across that portion 01 said side disposed around said bolt, whereby the lands will tend to embed themselves in the surface contacted by the nut or bolt.

3. In combination with a body to be held by a bolt'and nut iormed with an aperture through which such bolt is adapted to extend in relatively close fitting relationship; and a bolt fitted in said aperture; having a threaded end portion nut and the radially outwardly facing sides thereof being slightly tapered from said edge to the body of said nut to facilitate screwing said. nut on said bolt to tight engagement between its grooved side and the said member when the said sections oi said burr are moved to tight wedging relation between said bolt and the sides of said aperture adjacent said nut. Y

, BENJAMIN SOSNICK. 

